SYNOPSIS

PERL PROGRAM NAME:

AUTHOR: Juan Lorenzo (Perl module only)

DATE:

DESCRIPTION:

Version:

USE

NOTES

Examples

SYNOPSIS

SEISMIC UNIX NOTES SUPACK2 - pack segy trace data into 2 byte shorts

 supack2 <segy_file >packed_file	gpow=0.5 		



 Required parameters:						

	none							



 Optional parameter: 						

	gpow=0.5	exponent used to compress the dynamic	

			range of the traces			





 Credits:

	CWP: Jack K. Cohen, Shuki Ronen, Brian Sumner



 Revised: 7/4/95  Stewart A. Levin  Mobil

          Changed encoding to ensure 2 byte length (short is

	    8 bytes on Cray).



 Caveats:

	This program is for single site use.  Use segywrite to make

	a portable tape.



	We are storing the local header words, ungpow and unscale,

	required by suunpack2 as floats.

	

 Notes:

	ungpow and unscale are defined in segy.h

	trid = SHORTPACK is defined in su.h and segy.h



 Trace header fields accessed: ns

 Trace header fields modified: ungpow, unscale, trid

User's notes (Juan Lorenzo) untested

CHANGES and their DATES

Import packages

instantiation of packages

Encapsulated hash of private variables

sub Step

collects switches and assembles bash instructions by adding the program name

sub note

collects switches and assembles bash instructions by adding the program name

sub clear

sub gpow

sub trid

sub get_max_index

max index = number of input variables -1